Rane AC 23B Operator's Manual

In agreement with IEC and AES/ANSI standards, AC 23B wiring convention is pin 2 Positive, pin 3 Negative (return), pin 1 Signal ground (for unbalanced use), with the connector case or shell tied to chassis ground. Balanced Operation Use only when driving from a true balanced source and driving to a true balanced destination—either transformer coupled or active drive. Connect the input to pins 2 and 3 with pin 2 positive. Do not connect pin 1. Terminate the shield to the case or shell. Connect the output to pins 2 and 3 with pin 2 positive. Do not connect pin 1. Connect the shield t ...

Observe the labels screened above the controls for stereo operation. NOTE: In the 2-Way mode, the AC 23B crossover range is from 190 Hz to 7 kHz. The model AC 22 crossover in stereo 2-Way mode is recommended when the crossover point needs to be outside of this range. * Not used in 2-Channel 2-Way Mode
POWER switch: Two guesses.  POWER indicator: When this yellow LED is lit the unit is ready to operate.  CHANNEL 1 MASTER LEVEL control: Sets the overall Level of Channel 1 without altering the relative settings of the Low and High frequency Outputs. Unity gain for all level controls is at “7”.  LO ...

Observe the labels above the Inputs and Outputs for Stereo operation.
CHANNEL 1 INPUT: Plug the left output of the mixer, equalizer or other signal source to this Input. See ‘AC 23B Connection’ on page Manual-1 for wiring details.  CHANNEL 2 INPUT: Plug the right output of the mixer, equalizer or other signal source to this Input..  HIGH FREQUENCY OUTPUTS: Connect the CHANNEL 1 HIGH OUT to the left channel input of the high frequency amp, and the CHANNEL 2 HIGH OUT to the right channel input of the high frequency amp.  MID FREQUENCY OUTPUTS: Connect the CHANNEL 1 MID OUT to the left channel input ...

Observe the labels screened above the controls for stereo operation.
POWER switch: Two guesses.  POWER indicator: When this yellow LED is lit, the unit is ready to operate.  CHANNEL 1 MASTER LEVEL control: Sets the overall Level of Channel 1 without altering the relative settings of the Low/Mid/High frequency Outputs. Unity gain for all Level controls is at “7”.  LOW FREQUENCY LEVEL control: Sets the Level of signal going to the Low frequency Output only in this Channel. Refer to page Manual-15 for guidance with the Level control settings.  LOW MUTE switch: When pressed to the in position, all ...

Observe the labels above the Inputs and Outputs for Stereo operation.
CHANNEL 1 INPUT: Plug the left output of the mixer, equalizer or other signal source to this Input. Refer to ‘AC 23B Connection’ on page Manual-1 for wiring details.  CHANNEL 2 INPUT: Plug the right output of the mixer, equalizer or other signal source to this Input.  HIGH FREQUENCY OUTPUTS: Connect the CHANNEL 1 HIGH OUT to the left channel input of the high frequency amp, and the CHANNEL 2 HIGH OUT to the right channel input of the high frequency amp.  MID FREQUENCY OUTPUT: Connect the CHANNEL 1 MID OUT to the left channel of ...

Observe the labels screened below the controls for Mono operation.
POWER switch: Two guesses.  POWER indicator: When this yellow LED is lit, the unit is ready to operate.  MASTER LEVEL control: Sets the overall Level of the entire unit in Mono mode, without changing relative settings of the individual Sub/Low/Mid/High Outputs. Unity gain for all Level controls is “7”.  SUBWOOFER LEVEL control: Sets the Level of signal going to the Sub Output. See page Manual-15.  SUBWOOFER MUTE switch: Removes all signal from the Sub Output when pressed to the in position. This eases the system tune-up ...

5-Way mode since normal Stereo 3-Way operation demands it: a fact not the least bit obvious, but nevertheless, a fact it remains. See the section below for Mono 4-Way Jumper Instructions. The HI MID LEVEL control, HI MID MUTE switch, HI MID DELAY control and HI MID/HIGH FREQUENCY control are out of circuit and will have no effect regardless of their settings in 4-Way Mode.  Hl MID MUTE switch: Removes all signal from the Hi Mid Output when pressed to the in position. This control is disabled in 4-Way mode.  Hl MID DELAY control: This ...

**THIS OUTPUT IS NOT USED FOR 4-WAY MONO OPERATION. 4-WAY USERS SEE JUMPER INSTRUCTIONS ON PREVIOUS PAGE. Observe the labels below the Inputs and Outputs for Mono operation.
MONO INPUT: Connect the output from your mixer or other signal source only to the CHANNEL 1 INPUT for Mono operation; do not use the Channel 2 Input. See SYSTEM CONNECTION on page Manual-1 for wiring details.  SUBWOOFER OUTPUT: Connect the SUB OUT to the input of the subwoofer (or bass bin) amplifier.  LOW FREQUENCY OUTPUT: Connect the LOW OUT to the input of the low frequency (mid-bass) amp.  MID FREQUENCY OUTPUT: C ...

Note: The switching in the AC 23B will result in a Mono 4-Way configuration with the crossover ranges SUB, LOW, MID & HIGH from left to right across the front panel. By connecting a patch cable from the CHANNEL 1 HIGH OUT to the CHANNEL 2 INPUT, the LOW/MID crossover range changes from 70 Hz-1 kHz to a higher range of 190 Hz-7 kHz. Switch CHANNEL 1 to 3-Way, and CHANNEL 2 to 2-Way. Note: DO NOT follow the Mono 4-Way Jumper Instructions on page Manual-7.
MONO INPUT: Connect the output from your mixer or other signal source only to the CHANNEL 1 INPUT for Mono operation; do not use the Channel 2 I ...

frequency cut-off points for each driver, especially if these are supplied in a system. These cut-off frequencies are based on each driver’s performance at and beyond this point, with a certain safety margin to accommodate more gentle filter roll-offs and resultant higher output beyond the recommended performance range. The AC 23B utilizes 41-detent crossover frequency selectors which are precision potentiometers. The detents will assure consistent accuracy from Channel to Channel and unit to unit. This is a distinct advantage over the c ...

Fig. 2 Corrected In-Phase Axis Response With Electronic Time Delay on Low Frequency Driver Time Delay Adjustment Using Realtime Analyzer & Pink Noise This method outlines the use of a realtime analyzer, pink noise generator and flat response microphone to set crossover time delay. Some references will be made to the Rane RA 27 realtime analyzer for those with the intelligence and good taste to use one of these regularly. The procedure applies to virtually any analyzer system. We recommend using a 1/3 or 2/3 octave analyzer as either of these is more likely to match your specific crossover point ...

display shows +3 dB (red). The amount of displacement correction available from the Delay depends on the actual crossover frequency: the higher the frequency, the less amount of correction capability. If the drivers are built into a single cabinet and/or it is impossible to change relative positions, then you will have to obtain additional external delay to achieve proper phase alignment. The Rane AD 22B would be suitable. iv. If turning the MID DELAY control up makes the display reading decrease instead of increase, this means that the high driver is actually in front of the mid drive ...

that the tone is removed from the mid driver. Without re-adjusting either the meter or the crossover Input or Mid frequency Level controls, turn up the HIGH LEVEL control until the tone coming from only the high driver reads 0 dB on the SPL meter. 5. Now release the MID MUTE switch so that the tone is emitted from both the high and mid drivers. Check the reading on the SPL meter: i. If the meter reads +3 dB, then the drivers are properly phase aligned and no delay is necessary; leave the MID DELAY control at full minimum. ii. If the meter reads less than +3 dB, slowly turn up the MID DE ...

(Hz) .75" 1.5" 3" 6" 9" 12" 15" 18" 21" 24" 70 1 1.5 2 2.5 3.5 5 6 7 8 MAX 80 1 1.5 2 2.5 3.5 5 6 7 8 MAX 100 1 1.5 2 2.5 3.5 5 6 7 8 MAX 150 1 1.5 2 2.5 3.5 5 6 7 MAX 200 1 1.5 2 2.5 3.5 5 6 7 MAX 250 1 1.5 2 2.5 3.5 5 7 8 MAX 300 1 1.5 2 2.5 3.5 5.5 7 MAX 400 1 1.5 2 2.5 4 6 8 MAX 450 1 1.5 2 2.5 4 6 8 MAX 500 1 1.5 2 2.5 4 6 8 MAX 800 1 1.5 2 3 5 7 MAX lk 1 1.5 2.2 3 6 MAX 1.2k 1 1.5 2.2 3.5 MAX 1.5k 1 1.5 2.3 3.5 MAX 2k 1 1.5 2.3 MAX 2.5k 1 1.5 2.3 MAX 3k 1 1.7 2.4 MAX 3.6k 1 1.7 MAX 4k 1 1.8 MAX 6k 1 2 MAX 7k 1.2 MAX Delay vs. Frequency Table If you do not have the equipment necessary t ...

Choosing the crossover frequencies was the easy part. Now it gets real fun. The idea is to set the output Level controls on the crossover so that the entire speaker system has a uniform, flat response. Unfortunately, the room in which the speakers are placed has a habit of always getting into the act, so things get messy. As a result there seems to be two schools of thought regarding the use of active crossovers. The Set-lt-Once-And-Glue-lt School The philosophy here is to use the crossover to flatten system response as much as possible without room acoustics involved. This means setting up the system outsi ...

Meter & Pink Noise Generator The MUTE switches on the AC 23B make using an SPL meter an easy and relatively accurate means of tuning a system. First, obtain a good SPL meter from a local electron- ics or hi-fi store. Second, and perhaps a little trickier, get a hold of a pink noise generator—again try electronics stores. You may also use a sweep or tone generator in place of a pink noise source. If so, be sure to look at several different tones within each crossover section to get a good average driver response. 1. Run pink noise into the crossover Inputs (through the mixer or directly, as is convenient). 2. Make ...

2. Behind the Channel 2 LF DELAY pot find the jumper labeled W44. Behind the Channel 1 LF LEVEL pot find the jumper labeled W42. 3. To remove the Delay 3 circuit from the Low Frequency output, remove both the W42 and W44 jumpers. 4. To get the Low Frequency output to work again, install a long jumper from W44 Pin 1 to W42 Pin 2. 5. The Delay 3 circuit is now removed from all circuits. 6. To install the Delay 3 circuit into the Channel 2, High Frequency Output, find the jumper W51 behind the Channel 2 MF MUTE and remove it. 7. Install a long jumper from W42 Pin 1 to W51 Pin 2, and ...

Outputs It is possible to mono the Low Frequency Outputs of the AC 23B by an internal jumper modification. This requires that the Delay 1 and Delay 3 circuits be removed from the signal path, and that R33 be removed. The following proce- dure will assist you through the modification. Soldering is required. This modification should only be attempted by an experienced technician. DELAY ONE REMOVAL 1. Refer to the board layout on page Schematics-1 and on the circuit board. 2. Behind the Channel 1 LF LEVEL pot find the jumper labeled W4. Behind the Channel 1 LF DELAY pot find the jumper labeled W8. 3. To remove the Delay ...